Beat butter and sweetener until pale and fluffy, about 2 minutes.

Mix in almond flour, vanilla, and salt until a dough forms. Roll into a 1 ½-inch log, wrap, and chill 30 minutes.

Preheat oven to 325°F (160°C). Slice log into ¼-inch rounds, place on a lined sheet, and bake 10-12 minutes until edges are lightly golden. Cool on the pan 5 minutes, then transfer to a rack.